docs: def omnigraffle(self):
  		""" tries to open an export directly in omnigraffle """
  		temp = self.rdf_source("dot")
  
  		try:  # try to put in the user/tmp folder
  			from os.path import expanduser
  			home = expanduser("~")
  			filename = home + "/tmp/turtle_sketch.dot"
  			f = open(filename, "w")
  		except:
  			filename = "turtle_sketch.dot"
  			f = open(filename, "w")
  		f.write(temp)
  		f.close()
  		try:
  			os.system("open " + filename)
  		except:
  			os.system("start " + filename)